I bit the bullet and bought a AE 6th gen. I have had nothing but trouble getting it setup to mimic the old settings and it is not playing nice with my old AEBS and Time Capsule in regards to extending wireless network. Sometimes, they now lose the 5GHz network that I am trying to extend. It seems to go all awry when I set the 5GHz network to "Automatic". Then, I play hell to get everything back in working order. Right now, I have it on 149 and finally, it seems stable. I have been trying to get everything working, I have barely been able to see if I am getting a better connection. I checked my wife's Macbook Air (2013) that has AC on and the Tx Rate is 249. My Macbook Air (2012) is not a whole lot better, though I have seen it spike to 108, but been as low as 41. That's about what I was getting with the old router. In the same room as the router, of course, i get a Tx rate of 300Mbps.